Vision-based Displacement-sensitive Fringe Pattern for Identification of Crack in Rotating Shaft

doi:10.3901/JME.2022.20.304

Abstract

Abstract: Crack defect is a common failure form in rotating shaft. The breathing effect of crack defect will change the dynamic characteristics of rotating shaft and cause multiple frequency components in the radial displacement. A novel identification method using visual displacement-sensitive fringe pattern (DSFP) is proposed to determine the existence of transverse crack in rotating shaft. It can realize the efficient measurement of vibration signal and the rapid detection of the shaft crack defect. The dynamic equation of the cracked shaft and the measurement principle for the shaft radial two dimensional vibration using single camera and one DSFP are illustrated in detail. The mathematical relationship between the dynamic encoding parameters in the imaging DSFP and the real shaft radial displacement is established. The measuring results obtained both from the proposed system and the traditional two eddy current sensors based system verify the measurement accuracy of the proposed system. The multiple frequency components in the radial displacement of cracked shaft at different speeds are analyzed. When the rotation speed is close to half of critical rotation speed, the double frequency component is obvious and its amplitude is close to the rotation frequency amplitude, which can realize the effective detection of crack defect in rotating shaft system.

Key words: rotating shaft, crack defect, vision-based measurement, displacement-sensitive fringe pattern

CLC Number:

TH212

XU Tie, ZHONG Jianfeng, ZHONG Shuncong, ZHANG Qiukun, PENG Zhike, ZHANG Yan, LUO Manting. Vision-based Displacement-sensitive Fringe Pattern for Identification of Crack in Rotating Shaft[J]. Journal of Mechanical Engineering, 2022, 58(20): 304-311.

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